MWP Beck

This chart seems to be sourced from a chart done in the UK with the data smoothed. Originally presentec by E.G. Beck with the green circles added by RC team. RC - "It originally is taken from the first IPCC report of 1990: a scan of the original is shown in Figure 3. At that time, no large-scale temperature reconstructions were available yet. To give an indication of past climate variability, the report showed Lamb’s Central England estimate. (Unfortunately this was not stated in the report". http://www.realclimate.org/index.php?p=450